Apple Macintosh

The  is a brand of personal computers created by beginning in 1984. During the 1990s, the standard was based on a proprietary operating system (Mac OS ) and the of microprocessors. Later models replaced the Motorola 68k processor with the newer architecture, introduced in 1994. Most applications were then shipped as "universal binaries," which included versions of the code compiled to run on either architecture.

Doom-engine games officially ported to this platform include:
 * The Ultimate Doom, Doom II, and Final Doom
 * Hexen

Since then, the platform went through additional major standard changes:
 * The Mac OS operating system was replaced after version 9 by one based on (which is itself based on  and ), introduced in 2001, called . Some measure of backward compatibility was retained despite the OS change thanks to the  and emulation offered by the.
 * The PowerPC architecture was soon after replaced by the Intel, introduced in 2005. Again, backward compatibility was lost, necessitating the use of emulators. The emulator was provided with the operating system for this purpose initially, but has been discontinued by Apple.

These changes make it difficult to run 68k or PowerPC applications on a modern Intel OS X computer. Emulators such as may be required.